[PATCH][i386,AVX] Enable VAES support [1/5]

[Koval, Julia]

Hi,
This patch enables VAES isaset option. The doc for isaset and instruction: https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf

Ok for trunk?

Thanks,
Julia

gcc/
	* common/config/i386/i386-common.c (OPTION_MASK_ISA_VAES_SET,
	OPTION_MASK_ISA_VAES_UNSET): New.
	(ix86_handle_option): Handle -mvaes.
	* config/i386/cpuid.h: Define bit_VAES.
	* config/i386/driver-i386.c (host_detect_local_cpu): Detect -mvaes.
	* config/i386/i386-c.c (__VAES__): New.
	* config/i386/i386.c (ix86_target_string): Add -mvaes.
	(ix86_valid_target_attribute_inner_p): Ditto.
	* config/i386/i386.h (TARGET_VAES, TARGET_VAES_P): New.
	* config/i386/i386.opt: Add -mvaes.
	* doc/invoke.texi: Ditto.

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